Multi Pro 5700 - Toro

Boom Actuator Service (Machines with Serial Numbers Above 260000000)
IMPORTANT: Do not dismantle, repair or modify the
boom actuator. Internal components are not available
for the actuator. If an actuator is damaged or
worn, replace actuator.
CAUTION
During and after operation, the actuator may be
very hot. To avoid possible burns, allow the actuator
to cool before working on it.
Actuator Circuit Protection
Each boom actuator is protected internally by a thermal
circuit breaker. In case of actuator overheating, the thermal
breaker will trip, causing the actuator to cease functioning.
Once the actuator cools to appropriate
operating temperature, the actuator thermal breaker will
reset to allow actuator operation to resume.
A separate 30 amp thermal breaker also protects each
boom actuator circuit. These thermal breakers are located
at the machine fuse panel and will prevent circuit
operation if overloaded. The thermal breakers reset automatically.
Actuator Freeplay Inspection
Over time, actuator operation may be affected by air
captured in the reservoir oil. An excessive amount of air
in the actuator oil will allow excessive actuator freeplay.
Excessive freeplay will allow spray boom bouncing
when driving over severe terrain.
Measure actuator freeplay using the following procedure:
1. Move the vehicle to an open area and lower the spray
booms to the spray position.
2. Lift up on the boom at the last triangular gusset with
a 25 pound (11.4 kg) force. Support boom in that position.
3. Using a non–permanent felt tipped marker, mark the
cylinder rod at the outside of the cylinder seal.
4. Release the spray boom and allow it to return to the
spray (fully lowered) position.
5. Determine the actuator freeplay by measuring the
distance from the mark on the cylinder rod to the cylinder
seal. The freeplay should be less than 0.100” (2.5 mm).
If excessive freeplay is found, bleed air from actuator.
Actuator Air Bleeding
If actuator freeplay is excessive, air bleeding of the actuator
should be performed using the following procedure:
1. Thoroughly clean the exterior of actuator to prevent
contaminates from entering the actuator.
2. Make sure that the actuator cylinder is fully retracted.
IMPORTANT: To prevent actuator damage, use vise
with protective jaws when clamping actuator.
3. Place the actuator in a vise making sure that actuator
is clamped in the area identified in Figure 49. Use just
enough clamping force to hold the housing securely.
Make sure that the reservoir plug is orientated up.
CAUTION
The actuator reservoir is pressurized. If the reservoir
plug is removed too quickly, oil under
pressure can be ejected from the actuator.
4. Slowly loosen and remove the reservoir plug at the
top of the reservoir.
5. Using a light through the plug hole, confirm that the
reservoir oil is clear. If the oil appears milky, air is entrained
in the reservoir oil. Keep the actuator vertical
with the plug removed for approximately 15 minutes to
allow the air to separate from the oil.
6. When oil appears clear, use a 12 volt DC power supply
to power the actuator and extend the cylinder completely.
IMPORTANT: To ensure proper reservoir pressure,
make sure that cylinder is extended before installing
reservoir plug.
7. Install the reservoir plug and torque from 45 to 60 in–
lb (5.1 to 6.8 N–m).
8. If reservoir oil was milky, use power supply to contract
and extend the actuator cylinder 3 times. Repeat
steps 2 through 7 until oil is clear.
9. When actuator oil is clear and plug has been
installed, use power supply to fully contract the actuator
cylinder. Remove actuator from vise and install on machine.
Spray System Page 6 – 48 Rev. A Multi Pro 5700–D